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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f50301accea6e7c289743bf0e26dbbaeee35eebb6238cdb7b81209f452ca68b' 
  AND token = '3WBicZH6vkhT/GIrKyvDexJ+ck39nAHC2Hl4XhEFo2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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