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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724bbe0c8ef59c459224561f43e5327d3810c5a42ca87edd57b705e6fd2a78cb' 
  AND token = 'jba4Uun7xDPV8RWk1Yuv1feJQaKnokbkcDBmJGsKXdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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