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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98483c8b351e20dfa94b6b1fcba51510ecb0ddd571358cf7234b48f51f352550' 
  AND token = 'BN5XVBZKefCD/IWJGc8pOGpK4o2mgXBUCD1fZNCoGoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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