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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291342f02608d76a37ec03e0ca844cb1ac1385afad9ae032044bba0db8df0211' 
  AND token = '32hxS6gg8InfxzvR/lHt0SQG6FqNZa+yOsVeUD5+INw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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