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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdfd1c33f4c00d64e6625294eeabfd61117f5952eb26af7f5c24e1e8aea1b3f' 
  AND token = 'kdGqDW8INyxeuXIsEqJ9vNcp/70pQcPK2uyK/gD5NBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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