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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33f52b572a5f23e9aeb85fd7f2f9fd7d49c2ad68484aeab017c0675b8669b0b' 
  AND token = 'FS/EuovhA37trbFY7Q5MZLFMSsHigTvyhlR3t9H6eNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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