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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e68b19bc82efca1e5984b0bed2f8a554b4be2759732bd75921a039908b3abc' 
  AND token = 'qVMt4GllgRC5VmYO7RLX2Z+oGMvccLNkdKbnxtFsirM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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