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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e175941560527c906b235ca0c1c7851d1b0db0e665cdeb49ab204bd37bf5ba' 
  AND token = 'G3AjFYv1Lc/07TukInGbXmp7WpCjkEKbxXQW5F+Sg8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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