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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83241bf257779c494ee98a3f1d12a71b7eacceffc3e39c037bad9031b39996c8' 
  AND token = 'h+SjJLtfS4bpsca3HCqrBnEIoTnjq428rEDcUDL2d2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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