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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fced913a1c7c7bb27875061c3196de2b5b8538e1bb628ad7f30791e0f1d054a' 
  AND token = 'tT89hRKiktxVPvkTcQhIbh+CxjylX4JIh9TrSZhtMXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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