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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb4094b4b42373e79b50f518fee0ebd8deb1b231df451898a1c099eacaff3d7' 
  AND token = '/ZQk7rmd5NZOSzI0tq7NDyDQwn8LOsSvY+MJKxQwomE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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