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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03f1144ee073eb3ec7c53c7c55ef8ad86055675f05f5486df7d42a047c18775' 
  AND token = 'A0S5azahtyLQfOC9FLQ/NJzcdUhqNX+5xAy8+16Xavw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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