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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93abd2056f3cd98a53e747276000c837411dba9bdfcd043cbd0ff612fc28759' 
  AND token = '/qWtQ16g8VP6dCpUd1rMnEK9cDAY+frcbVK+l5t6Ybs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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