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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10aad7a7e5893cbf8129c01b94c33a7a31eccbac05566bf6b978a4f3edd5a88b' 
  AND token = 'rh2pvaY1aW1uei1EgWS0X4wfI6nEdKzkLiwfRXIXcAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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