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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439903eca29dd96135f758d13a59ddf330fe6e1a3695604d046752e5f45fac4a' 
  AND token = '04QG/vEM5pq9/az+02lWKfOSICDapDSNr0Zg45bnYl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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