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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6efc7cdbbe374eebcb30069e61f0e78c44fbcc440c0ccc24778176313a003a' 
  AND token = 'SGFYL6QXl+dJYYeXaPvmk0ovxSr9Lw0rnfDh5NGXVhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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