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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502215125bcf21d3864a9209081f0206dc2a1e2f23bca01c0c29538ebcae858f' 
  AND token = '8K5zIC4kO34rONr3tMgkYMd6pl9TkH0lqa9CKDs6d8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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