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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5898a7ccdb05345309d4bcda12b480c769d145a8c168f5fc5606ae515e054c4' 
  AND token = '9ksDYBS4jhpqMgOKkeOX+ciXcGZYcSEIs4paZUZSXQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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