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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a3b163c8ccc80f29e80b05927703dd9023e76cecec871f9525e12f43f70e8b' 
  AND token = 'GvCSy7hrqZ+SIMt1ITHBmLNZjGfFvHK+T0p1F8Jd4Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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