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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5456024f2c077f1cc85b2a170b1cf717e08f12bb324de5569c6d8386fedc3d' 
  AND token = 'HPEc1rd0Qdpkt5HHMT9Y11zelR7f7HZD4+7hEJuEyjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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