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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593ea072e17a72a88017761c3bc8bda129360678f3ee77fe102094dde39f5fe3' 
  AND token = '5PsHIQSl4NqINY2iOKf5nkG/82Jh45cKGfoTGMMVuxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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