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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6b850dcdf58fb773f3e1714ac9df3a6c7e4a77c27e5afa5e9a3628e742856d' 
  AND token = 'tsBDDAqBGtvPjNzSyKCJlbNm2MGeCoLON9al7u1JURg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}