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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65af5c60eb6b4d0c7d9ad62adc2e92da0317b18153fcea3dc77449338b24d60b' 
  AND token = 'XS9kQkdErz8tF+OyOK0v8ImDiSxBYSVlu2R+RRl4YGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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