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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c6f0c38082c5243c8f7e3e6f3457de575ca28f16af3b9a6f17993243f24e9f' 
  AND token = 'wv/vU1u9b9TISmb0pvi1guY/YW1MbxCuHrQ5ecfsG+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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