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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabfd6f5872f02733b2ed5cfedabe920d74b372e7a3de290b4cffb06defcd5a5' 
  AND token = 'YEZ4VavJFUz52js9kjKVi5cIOjDBf06vNNxzQgjS3/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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