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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dc6e71a2515d061d401b24cd6b6abdc0bffeb01e75e611c31b6f560c2901a0' 
  AND token = 'tV2dDpg+oCkPgNmK925B+NEppEXubt30lY35HhaQI5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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