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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03159ca8c3d6c14b93b7a9fb90e0ed795614f670bc136911c4381e24b7e8eaa' 
  AND token = 'ZbZOPCegsrQXyDHeCV9SGLywlegObZx64wv1JfUH8eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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