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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704cc364de68076a11d06feb156276fb866347ffa907fc4b0df9484a30e50eea' 
  AND token = 'W0QgAFuEJurGto3Dj1rmxHFXQuCx1t3AfDrFGCDZyl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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