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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116662aab7dfc0c094cee67bb8efcc4751fee29406f78bad4057a727aef91608' 
  AND token = 'Hfdv5iWYZQTmm3J42+/RHH9rdw9ot15iuOiEyOha8do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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