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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a478fbee0a633ae7543200c8ddde130e6cbe049df077be17d08c25bed5c31866' 
  AND token = 'dTu1s8YPc0p0WV2iBY+OF0/Mby/g2Bkn4Xtq6CeeivM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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