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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3fdb63a3c2025ca642a2158e07fc7d3d72c60aefd162dabbc626b2e37a2d91' 
  AND token = 'vX6aLOmmqQNWnQBXX6jeFsY1cU3UmQacL4b7loKFx1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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