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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4284bfed3df778176978ae8460ba691deffaeb7ad1a0d28f93da21a1328fa4' 
  AND token = 'rLitbdFn4F55KoYyf4ijJMuBckgpx1oSwsTyhb5SBzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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