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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bf6123ddd30f809c81560a6bef5c9e00ce7de6ae5fd536cf50664b0451f82a' 
  AND token = 'yjJicH6yym9Nwbofpcv5k5JqT1FkiaX3mQ7dPgg7mgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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