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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873d5071cae98201f30d306b1b2619b55e538b2c092c1d23d76023968ea3c729' 
  AND token = 'vwdaF3X85j11v7YTuEhOHxUbnJs4OK2VFojMFFx9RrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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