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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671fd7631b5d98e2a587980f7355570396d14faeb66875794d89faaaa4213106' 
  AND token = 'dq42Smy9kkDk/uyjmdBl9Pgi8/jLdUl7w413fzgokv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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