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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad1c5c8ba7eac3d54f5cb8e16146a270eac68d0ad52147835b074f4ad9db624' 
  AND token = '9J7MI+1B3VlUwkz8HcI478iXI/uoGfh6O6BKIFBh5dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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