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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c2405807bcdc70814070d48e464971c7dedf0a314c5d680a79c7c1d4127bbf' 
  AND token = 'lrNea5W28vKJAVy0iw5GT+x8gNsru8W+kjql/Gof91I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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