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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b830b7af436175f2b4a978a9e35eebd5d8af09374b4331a83c621a58fcad0db0' 
  AND token = 'atMy0SURtPNz/ANAz7cII/dIx9W40tCz9rGdDru7ndw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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