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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d94c01aed47d1a38e92f7fc01cf0bf6ba4e4b3a62f0ca7f35510f602dad3fc7' 
  AND token = 'E4rcDCim8iM3kAwAeJSHxfAhGT0uz5JsII6jiFoGul8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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