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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa00e834b2806be23c6776fea8d69af71d0b5b18b829e8611a11a6a03eb17d8' 
  AND token = 'fOAQaz0t5aJV7mcZK7KXBT/0aT/ioLmKkSTR/0agweo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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