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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f560d438367956ce778db2fc4aabaee1cf7e8985129d5ae7708537544a12ade5' 
  AND token = 'bhdMlcjPcIxUob2juk29N2dclo6wtT3AFzFiTW2U8iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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