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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74ce0c70ca3ed6cd8337cc31f3b7d7b8da27d6c4a07bd03c428d11ea91fcf1a' 
  AND token = 'EvIMFgoKafafkK/6TnFhXfv5aUkT0U6hHEOHgRtI/zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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