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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b43f4aa6a140a4f0ded1564e244b28c133fe80f533123afd189d075ddc2a67' 
  AND token = 'pKrMJGe4j24M5FBMK85BzwLybW9JhpufX9ikjeLV10w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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