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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a31ca04a13c5a2537d53101a48f55bebf8f19d9434cb476fe6be8bf7b45e007' 
  AND token = 'BcPsOkROOVQ0PrhNQJjszs0bY2cklZD9tsVNYXINBYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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