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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f4b8a3753469fa8aba4bc5c7941248152446dea4e341cd5926c2570e6c0599' 
  AND token = 'qug4K9dpGHRZDEfPehYyKCKxmLiBdUy3zG6One4PLB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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