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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8463ba492d07d428adc548a8f9a5fd8a88e25890cf7f0a6c04e188cd249a6799' 
  AND token = 'hVNShZ4X48ZeTVpN4khvbebcWdzNCP+RLFaFUG3C4+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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