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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3f0fc86d838b86e0c4ee5ea81f8e7441dce6b64960e65d6aa59a75a8c3ef04' 
  AND token = 'BB10RVmt8t4OOs0cb2wDFRG2l5daApCj6thGjXEjRKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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