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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31201e3706192086baf1dbe5eba88ba099a7f624468e3698093ee6449f11e5c3' 
  AND token = 'zdEOX75/bEgec2EtqABfKlr0mYF9vInYdCF58kBAFrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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