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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696fdd29ba3ad31a07c7a8ec7904518011a104db2cb3524667a54e23e6aeb51c' 
  AND token = '2oS20btUbNTiqNcYDD1WTiASux2x7oOZNam3MNjI85E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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