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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fba3dedade24bb30e085ae8bc229e9e724b94623fd45339bb0618e31787d589' 
  AND token = 'YXpOcdyeCntrmS7Bl0NLPZteARP85ehPLo5/3rVGmBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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