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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938439f95450a739624b218c67cb88c63fe57f12c3216576c8fed765c795f596' 
  AND token = 's0YK85Gea11VRwO3ny7ivx5xuVPZdGef4JrZok1PvRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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