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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063533e902d26b26331d251cd319653a1348ceb678998789b7c0734bcb45d576' 
  AND token = 'k16ii/+2EYh+Pc4B1VBpk6DvlQAOw7tkL3J4A39jF90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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