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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea944a1a8c065df2804dc6fd9ed981395d71ba2d4e3bb4e8c857319ceb74e6e' 
  AND token = '2C3OF5yVKHS5ZL3SdYfJAUG/BRguTwtta+4TcU3siAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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