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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed629bfec251d59e97683926463db5ead70003482bd70ef77324815a977b47e' 
  AND token = 'WqZLCaUdHNwUyBHVMXmSpexJ9Q1ZnHZs7YlXQYJLEp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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