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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2e2605b05c446b07bed3723c2d2b147cbd3f858715f95ec7e7b4630dc0bc48' 
  AND token = 'TpHaQ1lN4mzfV2PYBr12aAi9Y5uNI9Izu5utrxHmtw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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