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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5fab60189e9037b5d473c1c044c02191f1bf63e4c2c299c8e8b2a7b132df3e' 
  AND token = '8gvR4TEk1RzOuhIVEG4tHp76E77vVaUg+Iga1jekp+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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