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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767b45a418419f0cf0ce3b7bb4c6ea9360ea9b1d15c09ae08167b94cc473c1ce' 
  AND token = 'gxC5S2aHJnkBUgr6jIjPzkH73PEl1Qw+GU8FFsekCZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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