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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb2b31c90dacf9cf333d6d681a058a3e6e3998e7c91962b00b6c12d9b02e9ec' 
  AND token = '/FFsXymZuK3nfIWufdsRnjKSjO82UY1rs00nJFteZ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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