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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f7883a1a271e3b43cf8eae952aa4e01a7775945d83ed715368a58ace14428c' 
  AND token = '0v0YB4Ow4mcsMQsDV5HWHS3+lFUB+o2zG4HEfMlbIZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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