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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8083ede5b1c2c6d0ef96082aeca0d35200edfef45ab7ce3fee8665f1ddadb680' 
  AND token = '1yKF2o2QX89YNpwG4fAVwM2mUoEbPviq5n34a/wYbLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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