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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aee7e36a62d23baec3f3aa78c9bccfebb2b7cb16e7d3224a1d7d40a25ceddcf' 
  AND token = 'CgIH4VSFml1O5/qqaN8gyjZ5IU218J1lpVTRw2r8+sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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