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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afa304996fa66ce4aec195d4b9cebd3cf2a6aa2d59618cb76fbd9c30ebdaf77' 
  AND token = 'bFcAY52qnu9hqlC8mre1nrfSB/WpsH5r3bn+QCXu1Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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