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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb038c81ca5f179a84a8127f1d092a4c86bb9245961d5a340f0b1a82330c4d00' 
  AND token = 'MMv1ZAwObrvddM+scmo5eCJ+tZb3Q+Xt6PCtCVMlkmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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