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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae7cbc0263c9436804369d4929831121fb7833d58ed30103d5d360688f7a934' 
  AND token = 'OHER+/Hqv1m0FzRmptnaqTT4zEVL/ALoPaFTZyo02es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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