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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79514e320ee912e773d19e15091c2e032b5cabe937325b817b936b322eef6394' 
  AND token = 'we/m76H8vsoRtdBJ3U5JrQN73aLGOQ89xwBtaC97H2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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