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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc617758961dd6ef79a0b6f1b8d74ad0fad0c23a5edf92a36c38e8562e478b3e' 
  AND token = 'wmplcnhWd1mXsnjqdZATCkbqu8FtjpiL3qkRP2xMLrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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