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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea806bfc7a2f28bfa95be30a4a30e7cd3803b5e5bf9cd2532d9a997e37e5a9a' 
  AND token = 'mmLzNfPnkL9MFp8OvLDD1/GzRmioCXdnw7a83rqhYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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