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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da2081600651d36e61f2de75a56f8bfa1f6eb8d363bed3e6e8e89e66934d006' 
  AND token = '+CjcYXm/yHDNgkz2Fl996BYIN71l1Bc1hjKJ4wHwHTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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