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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a310430f58b01ab8bc49cb6a1cb5e8f7ee9df6bf1c9ffece1da4c8c08d76dcb6' 
  AND token = 'FmyXMJD7dC4aA2D9y4xkfpQhLxB4VI1gZ8o6dbQvi8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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